2,3‐Dichloro‐5,6‐Dicyano‐1,4‐Benzoquinone (DDQ)‐Mediated Tandem Oxidative Coupling/Intramolecular Annulation/Dehydro‐Aromatization for the Synthesis of Polysubstituted and Fused Pyridines
作者:Dongping Cheng、Zhiteng Deng、Xianhang Yan、Mingliang Wang、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201900956
日期:2019.11.5
A DDQ‐mediated tandem reaction of 1,3‐diarylpropenes and β‐enaminoesters/4‐aminocoumarins is disclosed. It involves oxidative coupling, intramolecular annulation and dehydro‐aromatization reaction, which provides an efficient and mild method for the synthesis of polysubstituted and fused pyridines under metal‐free conditions.
Facile synthesis of pyrido[2,3-d]pyrimidines via cyclocondensation of 4,6-dichloro-2-methylsulfanylpyrimidine-5-carbaldehyde with β-substituted β-aminoacrylic esters
作者:Maria E. Chizhova、Olga Yu. Bakulina、Alexander Yu. Ivanov、Pavel S. Lobanov、Dmitrii V. Dar'in
DOI:10.1016/j.tet.2015.06.085
日期:2015.9
A new facile synthesis of pyrido[2,3-d]pyrimidin-4-ones via cyclocondensation of 4,6-dichloro-2-methylsulfanylpyrimidine-5-carbaldehyde with β-alkyl and β-aryl-β-aminoacrylic esters followed by hydrolysis of chlorine atom at position 4 of pyridopyrimidine ring has been developed. The cyclocondensation was found to be accelerated by acid.
通过4,6-二氯-2-甲基硫烷基嘧啶-5-甲醛与β-烷基和β-芳基-β-氨基丙烯酸酯的环缩合反应然后水解,可轻松合成吡啶并[2,3 - d ]嘧啶-4-酮已经开发了在嘧啶并嘧啶环的4位的氯原子。发现环缩合被酸加速。
Synthesis of Thiazoles and Isothiazoles via Three-Component Reaction of Enaminoesters, Sulfur, and Bromodifluoroacetamides/Esters
作者:Xingxing Ma、Xiaoxia Yu、Hua Huang、Yao Zhou、Qiuling Song
DOI:10.1021/acs.orglett.0c01275
日期:2020.7.17
three-component strategy for the synthesis of thiazoles and isothiazoles has been developed by employing enaminoesters, fluorodibromoiamides/ester, and sulfur. The thiazoles and isothiazoles were formed via two C–F bond cleavages along with the formation of new C–S, C–N, and N–S bonds. The strategy provides high selectivity for the synthesis of thiazoles/isothiazoles, which have vital applications in
Uracil derivatives and pesticides containing the same as active
申请人:Nissan Chemical Industries Ltd.
公开号:US05116404A1
公开(公告)日:1992-05-26
The present invention provides novel uracil derivatives and pesticides which contain the novel uracil derivatives as an active ingredient, and exhibit preventing and controlling effects against harmful living things, especially agricultural insect pests, sanitary insect pests, stored product insect pests, house insect pests and veterinary insect pests at a very low drug-concentration.
IBX facilitated the reaction of beta-enamino esters with allylic alcohols affording a direct, one-pot and metal free synthesis of functionalized pyridines including 2-substituted nicotinic acids, densely substituted pyridines and precursors of azafluorenones. The methodology also afforded the racemic pyridine core of cyclothiazomycin.